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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Assets and Liabilities Associated with MSC (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	$ 65,176	$ 59,376
Total assets	623,207	616,941
Current liabilities	(34,295)	(36,012)
Total liabilities	(135,193)	$ (130,995)
Balance excluding FV increments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	71,226
Total assets	190,935
Current liabilities	(38,675)
Total liabilities	(67,110)
Adjustments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	341
Total assets	129,493
Total liabilities	(9,754)
Balance including FV increments | MSC
INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE
Current assets	71,567
Total assets	320,428
Current liabilities	(38,675)
Total liabilities	$ (76,864)

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